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※ 7.1 Fault Messages
Sunways STH 3~8kW series single-phase hybrid inverter is designed in accordance with grid
operation standard, and conform to the requirements of the safety and EMC. The inverter
had passed a series of rigorous tests to ensure it runs sustainably and reliably before ship-
ment. When a fault occurs, the corresponding fault messages will display on the OLED dis-
play, and in this case, the inverter might stop feeding into grid.
The fault messages and their corresponding troubleshooting methods are listed below:
7 Troubleshooting
Error Message
Solution
Mains Lost
① Check whether the mains supply is lost.
② Check whether the AC breaker and terminal are well connected.
Grid Voltage Fault
① Check whether the impendence of the AC cable is too high to
lead the grid voltage increased. Change a thicker AC cable if it is.
② Extend the voltage protection range if it is allowed by the electricity
company.
Grid Frequency Fault
① Check whether the AC cable is correct and well connected.
② Change to another country with wider protection range if it's allowed
by the local electricity company.
DCI Fault
① Restart the inverter.
② Seek for help from the installer or manufacture.
Error Message
Solution
PV Power Low
① Check if part of the PV array is sheltered.
② Check if the sunlight is sufficient at the PV installed area.
Bat OV
① Check whether the battery voltage exceeds the upper limit of the battery.
② Check battery terminal wiring.
Backup OV
① Restart the inverter.
② Check the inverter Backup side wiring.
Bus Volt Low
① Restart the inverter.
② Seek for help from the installer or manufacture.
Hard Fault
① Restart the inverter.
② Seek for help from the installer or manufacture.
Backup OP
① Reduce loads connected in the Backup side.
② Restart the inverter.
Inverter OV
① Restart the inverter.
② Seek for help from the installer or manufacture.
7 Troubleshooting
7 Troubleshooting
Summary of Contents for STH 3-8kW Series
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